NASICON-type NaMo2(PO4)3: Electrochemical activity of the Mo+4 polyanion compound in Na-cell

Rodion V. Panin, Oleg A. Drozhzhin, Stanislav S. Fedotov, Nellie R. Khasanova, Evgeny V. Antipov

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Vital need to reduce battery cost inspired intensive research in the field of sodium-storage systems, which required extending the range of perspective electrode materials. Herein, we present a new member of the electrochemically active NASICON material family, rhombohedral NaMo2(PO4)3, which demonstrates both Mo+4/Mo+5 and Mo+4/Mo+3 redox activities towards sodium (de)intercalation. Desodiation of the initial NaMo2(PO4)3 material with subsequent discharge within the 1.2–4.0 V range leads to a multi-electron redox transition with reversible capacity of 130 mAh g−1. However, the single Mo+4/Mo+3 redox transition at 2.45 V (vs. Na/Na+) with capacity of 95 mAh g−1 was found to be more stable during cycling, and operando X-ray diffraction confirmed its two-phase mechanism. Sodiation of the initial phase results in Na2.5Mo2(PO4)3, which maintains the parent NASICON structure (R-3c, a = 8.90532(7) Å c = 22.2379(3) Å V = 1527.30(3) Å3), with two Na-positions being almost equal in occupancy and energy.

Original languageEnglish
Pages (from-to)168-174
Number of pages7
JournalElectrochimica Acta
Volume289
DOIs
Publication statusPublished - 1 Nov 2018

Keywords

  • Freeze drying
  • Multi-electron redox transitions
  • Na-ion battery
  • NASICON-type materials
  • Reversible sodium (de)intercalation

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